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Closures: javascript interview question


Write a function sum which can accept both the syntax.

sum(5, 3) // 8
sum(5)(3) // 8


  • Whenever the sum is called we need to detect if its called with two arguments of one.
  • If its called with two arguments then the problem is very simple
  • Else the sum function returns another function which has accepts one argument and it has access to the variable a via closure.



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